diff --git a/common/changes/@itwin/imodel-browser-react/mn-18rem_2026-08-18-11-37.json b/common/changes/@itwin/imodel-browser-react/mn-18rem_2026-08-18-11-37.json
new file mode 100644
index 00000000..d0ca78a1
--- /dev/null
+++ b/common/changes/@itwin/imodel-browser-react/mn-18rem_2026-08-18-11-37.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@itwin/imodel-browser-react",
+      "comment": "use consistent tile size in iModel and iTwin grids",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@itwin/imodel-browser-react"
+}
\ No newline at end of file
diff --git a/packages/modules/imodel-browser/src/mui/containers/ITwinGrid/ITwinGridMUI.tsx b/packages/modules/imodel-browser/src/mui/containers/ITwinGrid/ITwinGridMUI.tsx
index c5489bdd..5603e9b5 100644
--- a/packages/modules/imodel-browser/src/mui/containers/ITwinGrid/ITwinGridMUI.tsx
+++ b/packages/modules/imodel-browser/src/mui/containers/ITwinGrid/ITwinGridMUI.tsx
@@ -204,7 +204,7 @@ const ITwinGridMUIInternal = ({
       sx={{
         display: "grid",
         gap: 2,
-        gridTemplateColumns: "repeat(auto-fill, minmax(18rem, 1fr))",
+        gridTemplateColumns: "repeat(auto-fill, 18rem)",
         listStyle: "none",
         alignItems: "stretch",
         "& > li": {
diff --git a/packages/modules/imodel-browser/src/mui/containers/iModelGrid/IModelGridMUI.tsx b/packages/modules/imodel-browser/src/mui/containers/iModelGrid/IModelGridMUI.tsx
index 379b0bfb..8ca25365 100644
--- a/packages/modules/imodel-browser/src/mui/containers/iModelGrid/IModelGridMUI.tsx
+++ b/packages/modules/imodel-browser/src/mui/containers/iModelGrid/IModelGridMUI.tsx
@@ -361,7 +361,7 @@ const IModelGridInternal = ({
             sx={{
               display: "grid",
               gap: 2,
-              gridTemplateColumns: "repeat(auto-fill, minmax(18rem, 1fr))",
+              gridTemplateColumns: "repeat(auto-fill, 18rem)",
               listStyle: "none",
               alignItems: "stretch",
               "& > li": {